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Schematic diagram of the thin-layer, two-electrode sensing platform. The multiplexed platform contains two 5 × 3 arrays of 1-mm diameter gold electrodes embedded in Teflon blocks, separated by a Teflon spacer to form a solution well. The top (secondary) array contains four holes into which reference and auxiliary electrodes can be inserted. The bottom (primary) array features the same number and positioning of electrodes as the top array.
